Safety valve for viscous fluids



STEAM .ETEA/W. OUTLET simi/MTM UPA/5 las Filed March 16, 1948 "III 'lulI|I| mmm .Am-ih z, w50

Patented Apr. 25, ,195() l'TEDT STATIES QFFLCE;

1 Claim.

This invention relates to safety valves, and more particularly, tosafety valves for controlling the flow of viscous fluids.

Devices of this general character have heretofore required theassociation therewith of external heating means for preventing theViscous uid from freezing the valve disc, or interfering with the rapidresponse of said disc in accordance with the fluctuations in the fluidpressure.

Heating means so located have certain disadvantages. For one thing, theyinterfere with free access to the valve for adjustment or otherpurposes. For another, the amount of heat required to maintain suitablefluid density within the valve is excessive.

It is, therefore, the main object of the present invention to provide asafety valve for the purpose indicated which overcomes the abovementioned disadvantages by incorporating in the interior thereof heatingmeans which does not interfere with the normal adjustment or operationof the valve and which requires the application thereto of considerablyless heat than has heretofore been the case.

In the accompanying specification there shall be described and in theannexed drawing shown an illustrative embodiment of the safety valves ofthe present invention. It is, however, to be clearly understood that thepresent invention is not to be limited to the exact details herein shownand described for purposes of illustration only, inasmuch as changes maybe made therein without the exercise of invention and within the truespirit and scope of the claim hereto appended.

In said drawing, the single ligure is a vertical sectional view takensubstantially through the center of a, safety valve made in accordancewith the present invention.

Referring now more in detail to the aforesaid illustrative embodiment ofthe present invention, with particular reference to the drawingillustrating the same, the numeral l generally designates a safety valveincluding a valve body Il having a central chamber l2 and inlet andoutlet ports I3 and l communicating with said central chamber, a bonnetl5 mounted on said body and providing a spring chamber IB, and a cap Ilsecured at the upper end of said bonnet.

Threadedly engaged in the inlet port I3, and extending into the centralchamber I2, is a high velocity nozzle i8 at the inner end of which thereis formed a Valve seat (not shown) Secured intermediate the body Il andthe bonnet l5 is a baffle I9, said baille isolating the central chamberI2 from the spring chamber I6, and

depending from the central portion of said baille is a cylinder 2U.

Slidably mounted in the cylinder 20 is a sleeve 2l formed on adisc-holding member 22, said discholding member being constructed asshown in my copending application entitled Safety valves, Serial No.788,901, led November 29, 1947, and incorporating a valve disc (notshown) cooperable with the seat formed on the nozzle i8, and beingsecured to a valve stem 23, also as shown in said copending application.

The stem 23 rises through the spring chamber I6 and has its upper endguided in a springadjusting screw 24 engaged in the bonnet I5, saidscrew bearing against a button 25 which is loosely mounted on said stemand which, in turn, bears against the upper end of a coil spring 26 thelower end of which abuts another button 21 which is fastened on thestern 23. The screw 24 is adapted to be locked in position by a nut 28.

A plate 29 is threadedly engaged on the nozzle I8 adjacent the inner endthereof, and supported on said plate in close proximity to thedisc-holding member 22, the bearing cylinder 2), and the valve disc andvalve seat, as by being wrapped about said members, is a steam coil 3D,said steam coll serving to heat the central chamber l2 and the elementshoused therein, whereby the valve of the present invention is madecapable of handling viscous fluids which would, in the absence of heat,cause the valve to stick or respond to variations in pressure in asluggish manner.

One end of the coil 3!) communicates, through a coupling 3|, with anysuitable source 32 of steam or other heating medium. The other end ofsaid coil 3E communicates, through a coupling 33, with a steam outletpipe 34.

The pipe 34 includes a T-connection 35 which communicates through a pipe36 with a conventional trap 31 for removing from the heating system anywater condensing therein.

This completes the description of the aforesaid illustrative embodimentof the safety valves of the present invention. It will be noted from allof the foregoing that the present invention provides, in a simple,eiiicient and inexpensive manner, a safety valve capable of controllingthe now of fluids of appreciable density. Other objects and advantagesof the present invention will readily occurs to those skilled in the artto which the saine relates.

What is claimed is:

A safety valve comprising: a valve body provided with a central chamber,and inlet and. outlet ports communicating with said central chamber;

3 a nozzle communicating with a source of viscous uid the flow of whichis intended to be controlled by said valve; said nozzle extending intosaid central chamber through said inlet port and being provided with avalve seat at the inner end thereof; a spring pressed valve discslidably mounted in said body and cooperable with said seat; a platemounted on said nozzle adjacent said seat and a conduit supported onsaid Plate; said conduit communicating at one end with a source of steamindependent of and exteriorly located with respect to said valve, andsaid conduit communicating at the other end with the atmosphere, saidconduit being coiled within said central chamber about and immediatelyadjacent 15 said disc and seat.

VICTOR W. FARRIS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,398,151 Ralston Nov. 22, 19211,633,161 Cavenagh June 21, 1927 1,949,930 Davidson Mar. 6, 19342,015,024 Yarnall Sept. 17, 1935 2,034,222 Baker Mar. 17, 193B 2,062,246Atkinson Nov. 24, 1936

